Characterization and hot corrosion performance of LVPS and HVOF-CoNiCrAlYSi coatings

► Development of CoNiCrAlY coating by using low vacuum plasma spray and high velocity oxy-fuel. ► Hot corrosion behavior and microstructure change of coatings at 880 °C in the Na2SO4-20%NaVO3 salt. ► More lifetime of HVOF coating due to formation of dispersed α-Al2O3 in the HVOF process. ► Change of oxide morphology due to spallation and acidic fluxing are the main degradation mechanisms of these coatings.